'Gilmore Girls' Revival Pays Tribute to Edward Herrmann

— -- There is a noticeable absence on the set of the new "Gilmore Girls."

Edward Herrmann, who played Grandpa Gilmore, died in December 2014. But the new show, "Gilmore Girls: A Year in the Life," will address his character's death.

"He would have loved this [new series]," Lauren Graham, 49, who played his daughter Lorelai Gilmore, told People in a new interview. "His death was just a loss for us personally. It's given the show a new complexity and depth. It's a nice tribute to him."

Alexis Bledel, who played his granddaughter Rory, said, "He was wonderful to work with. Very generous and such a great presence to have on-set always."

Nine years after the beloved series ended, Graham and Bledel returned to the familiar set to film the new series.

"Walking back into the Gilmore house made me feel like, 'I'm at home. I have to behave. Sit up straight!'" Graham said.

Herrmann's death was a huge change for Graham and Bledel's characters, but it's not the only one.

"The characters are older now and really are just supporting each other, which I think is a natural progression for a mother and daughter," Graham said.

"Their dynamic is so unique," Bledel added. "There's nothing else like it."

Last month Graham told ABC News that making the four-part series has been "very satisfying."

"The thing one might worry about is, does it feel like just nostalgia or was there really reason to go on?" she told ABC News after announcing the Emmy nominations alongside Anthony Anderson. "I think they were some of the most wonderful episodes we've ever had and it feels brand new but still the same show. So it's very satisfying."